GRUNDFOS INSTRUCTIONS
CR, CRI, CRN 1s, 1, 3, 5, 10, 15, 20
CR, CRN 32, 45, 64, 90, 120, 150
Double seal (back-to-back)
Installation and operating instructions
English (GB) Installation and operating instructions
Caution
Note
Caution
English (GB)
Original installation and operating instructions.
CONTENTS
1. Symbols used in thi s do cumen t
2. General informati on
3. Product description
4. Applications
5. Maximum liquid pressure and temperature
6. Barrier fluid connections
7. Pump with pressure intensifier
7.1 Components of pressure intensifier
7.2 Dimensions of pump with pressure intensifier
8. Pump with dosing pump
8.1 Dimensions of pump with dosing pump
9. Startup
9.1 Pump with pressure intensifier
9.2 Pump with dosing pump
10. Maintenance
11. Operation
11.1 Frost protection
12. Disposal
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
1. Symbols used in this document
Warning
If these safety instructions are not observed,
it may result in personal injury.
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Notes or instructions that make the job easier
and ensure safe operation.
Page
2. General information
These installation and operating instructions are a supplement to
installation and operating instructions for standard CR, CRI, CRN
pumps, publication No 96462123, and for CRN-SF pumps,
publication No 96530119.
2
2
3. Product description
2
This type of double seal consists of two shaft seals mounted in a
2
"back-to-back" arrangement in a separate seal chamber.
2
The pressure in the seal chamber is higher than the pump
3
pressure.
4
The double seal arrangement with pressurised seal chamber
4
prevents the pumped liquid from leaking to the environment via
4
the shaft seal.
The pressure in the seal chamber can be generated in three
4
ways:
4
• by means of a pressure intensifier (section 9.1)
5
5
• by means of a dosing pump (section 9.2)
6
• by means of an already existing system.
7
7
4. Applications
7
The shaft seal is available for the following Grundfos pumps:
7
Pump
CR 1sCR 1CR 3CR 5CR 10CR 15CR 20CR 32CR 45CR 64CR 90CR
type
CR
CRI
CRN
This type of shaft seal is the optimum solution when handling
abrasive or sticky liquids which would either wear out, damage or
block a mechanical shaft seal.
Recommended for applications involving toxic, aggressive or
flammable liquids, the seal shaft protects the surrounding
environment and the people working in the vicinity of the pump.
If the shaft seal is used in applications where
special safety precautions must be observed due
to hazardous liquids, the customer bears full
responsibility!
5. Maximum liquid pressure and temperature
Due to the shaft seal design, the pressure in the seal chamber
must not exceed 25 bar. The pressure of the barrier fluid must
always be higher than the pressure of the pumped liquid.
The maximum temperature of the barrier fluid depends on the
rubber material of the shaft seal.
120CR150
Shaft seal Maximum temperature [°C]
EPDM +120
FKM +90
FFKM +120
FXM +120
2
6. Barrier fluid connections
Sensor
Inlet 1/2"
Outlet 3/8"
C/D
A
E
A
C/D
E
Sensor
Inlet 1/2"
Outlet 3/8"
C/D
A
E
A
C/D
E
Inlet 1/2"
Sensor
A
A
C/D
E
E
Outlet 3/8"
C/D
Key to the letters in the drawings:
Pos. A = pumped liquid.
Pos. C/D and E = barrier fluid.
Figures 1, 2 and 3 show where to fit a sensor (pos. A),
if retrofitted.
English (GB)
Fig. 1 Seal chamber CR, CRI, CRN 1s, 1, 3, 5
Fig. 2 Seal chamber CR, CRI, CRN 10, 15, 20
TM04 3225 3908TM04 3226 3908
Fig. 3 Seal chamber CR, CRN 32, 45, 64, 90, 120, 150
TM04 4080 0909
3
Loading...